Samuel l



(No Model.)

$. L. BEAN.

- ROLLER GRINDING MILL. No. 265,002.- Patented Sept. 26, '1882.

n. PETERS P'llcln-Lllhngrapbar. Wmhinglcn. n. c.

UNITED STATES PATENT @FFEE.

SAMUEL L. BEAN, OF WASHINGTON, DISTRICT OF COLUMBIA.

ROLLER GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 265,002, dated September 26, 1882,

Application filed March 28. 1882. (No model.)

To all whom it may concern Be it known that I, SAMUEL L. BEAN, a citizen of the United States, residing at Washington, District of Columbia, have invented certain new and useful Improvements in Roller Grindin g-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and use the same.

This invention is designed to he an improvement upon a roller grinding-mill described in my application for United States Letters Patent filed July 13, 1881; and it consists principally of the combination of cant-boards with rotating screening-cylinders, such cant-boards extending from one end to the other thereof, so as to catch all the fine flour and middlings which may be sifted through such screeningcylinder and discharge the same through openings in the sides of the chest or into any receptacle within the chest, as may be deemed most expedient under the circumstances.

In order that myinvention may be clearly fall upon such screening-cylinder on. a line at some little distance from the vertical plane of the axis of said cylinder, so that the tendency of the chop will be to slide down that side' of the screening-cylinder adjacent to the next screening-cylinder below. From the upper screeningmylinder of each set, which will sift out a portion of the fine flour and middlings, the remaining chop is received upon a cantboard, 0, by which it is directed to fall upon the adjacent side of thenext screening-cylinder, from which, after sliding over it for some distance and being further screened, the chop falls again upon a cant-board, which directs 0 it to fall upon the adjacent side of the third I screening-cylinder, over which it again slides some distance, and is then received upon a third cant-board, O, which delivers it upon the next pair of grinding-rollers for further reduction. The chop is thus subjected to three separate screens in its passage from one set of grinding-rollers to the next set. Under each cant-board G, and close to the screening-cylinder which delivers the chop upon said cantboard, is arranged abrush, E, preferably a retating brush rotated in the direction indicatedby the arrow, for the twofold purpose of cutting off the escape of chop along that line and of brushing the screening-cylinder to clean its meshes. Under each screening-cylinder is arranged a second cant-board, D, at about right angles to the cant-board G, for the purpose of catching all the fine flour and middlings th at may fall through the screeningcylinders, and of delivering such fine flour and middlings to any desired receptacle, either within or without the chest F. In the example illustrated I have shown this cant-board D as delivering the fine flour and middlings through openings in the sides of the chest. All the cant-boards G and D extend the whole length of the screening-cylinders, and must be placed at theproper angle for discharging the material delivered upon them-say ahoutfortyfive degrees. I

Instead of rotary brushes E, stationary brushes may be used, in which case such brushes may be fastened to the under side of the cant-boards 0, so as to bear with some force against the adjacent screening-cylinder, vthus forming both a cut-off for the chop and a brushforcleaning thecylinder. Thescreeningcylinders may he so arranged with respect to each other that the cantboards O can be dispensed with, the lowermost screening-clyinder between each set of rollers being so located that the chop will fall from it either directly or over a cant-board into the bite of the rollers beneath.

If desired, the screeningcylinders may be constructed with automatic knockers for the purpose of periodically knocking said cylinders to aid in the discharge therefrom of the fine flour and middlings. I prefer to use several screening-cylinders between each set of rotating them belt-gearing may be used.

grinding-rollers; but that is not absolutely esl sential, as by the use of a single screeningcylinder between each set of grinding-rollers very good results may be obtained. The screening cylinders or rotating cylindrical screens are preferably rotated in the direction indicated by the arrows applied to them. For

Having thus described my invention, what I claim is 1. The combination, substantially as before set forth, of a pair of grinding-rollers, a r0tating cylindrical'screen, onto the exterior surface of which the chop from the rollers falls, and a cant-board under said cylindrical screen for catching and delivering the fine flour and middlings sifted from the chop by the screen.

2. The combination, substantially as before set forth, of a pair of grinding-rollers, a series of rotating cylindrical screens arranged stepwise, a cant-board for directing the chop from one screen onto the next screen, a brush under each such cant-board, and a second cant-board under each screen for catching and delivering the fine flour and middlings sifted from the chop by the screen.

In testimony whereof I affix my signature in presence of two Witnesses.

SAML. L. BEAN.

Witnesses:

(J. A. NEALE, O. S. HYER. 

